package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl  implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Autowired
    private  SetmealMapper setmealMapper;
    /**
     * 新增菜品和对应的口味
     * 涉及到两张表所以加一个transcationl(事务的一致性)
     * @param dishDTO
     */
    @Override
@Transactional
    public void saveWithFlavor(DishDTO dishDTO){

        //保存一个实体
        Dish dish = new Dish();

        BeanUtils.copyProperties(dishDTO,dish);
        //向菜品表插入一条数据
             dishMapper.insert(dish);
             //获取insert语句中生成的主键值
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors !=null && flavors.size()>0){
            flavors.forEach(dishFlavor ->{dishFlavor.setDishId(dishId);});
            //向菜品表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }

    }




    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {

        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page <DishVO> page= dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }



    /**
     * 保持事务的一致性：涉及多张表
     * 菜品批量删除
     * @param ids
     */
    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {

        //判断菜品是否能删除 判断当前菜品是否被关联了
        for (Long id : ids) {
          Dish dish=  dishMapper.getById(id);

          if (dish.getStatus().equals(StatusConstant.ENABLE)){
            //判断当前菜品处于起售中不能删除
              throw  new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
          }
        }
        //判断当前菜品是否能够删除，是否关联了菜品
        List<Long> setmealids = setmealDishMapper.getSetmealDishIdsByDishIds(ids);
        if (setmealids !=null && setmealids.size()>0){
            //当前菜品被关联了不能删除
            throw  new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }


        for (Long id : ids) {

            //删除菜品表中的菜品数据
            dishMapper.deleteById(id);
            //删除菜品关联的口味数据
            dishMapper.deleteByDishID(id);
        }



    }
//    @Override
//    public void deleteBatch(List<Long> ids) {
//        //判断菜品是否能删除，判断档期那菜品是否被关联了
//        for (Long id : ids) {
//           Dish dish= dishMapper.getById(id);
//           if (dish.getStatus().equals(StatusConstant.ENABLE)){
//               //当前菜品处于起售中不能删除
//               throw  new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
//           }
//        }
//        //判断当前菜品是否能古能够删除，是否关联了菜品
//        setmealDishMapper.getSetmealDishIdsByDishIds(ids);
//
//    }

    /**
     * 根据id查询菜品和对应的口味数据
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //根据id拆线呢菜品数据
       Dish dish= dishMapper.getById(id);
        //根据菜品id查询口味数据
        List<DishFlavor> dishFlavors= dishFlavorMapper.getByDishId(id);
        //将查询的数据封装到vo
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);

        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }

    /**
     * 根据id修改菜品基本信息和对应的口味信息
     * @param dishDTO
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //修改菜品表基本信息

        dishMapper.update(dish);
        //删除原有的口味数据
        dishMapper.deleteByDishID(dishDTO.getId());

        //重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors !=null && flavors.size() >0){
            flavors.forEach(dishFlavor -> dishFlavor.setDishId(dishDTO.getId()));
        }
        //插入n条数据
        dishFlavorMapper.insertBatch(flavors);


    }

    /**
     * 更新状态
     * @param status
     * @param id
     */
    @Override
    public void startStop(Integer status, Long id) {

        Dish dish = new Dish();
        dish.setId(id);
        dish.setStatus(status);
        dishMapper.update(dish);
        if (status.equals(StatusConstant.DISABLE)){
            //如果是停售操作，还需要将包含当前的菜品的套餐也停售
            List<Long> DishIds = new ArrayList<>();
            DishIds.add(id);

            List<Long> setmealIds = setmealDishMapper.getSetmealDishIdsByDishIds(DishIds);
            if (!CollectionUtils.isEmpty(setmealIds)){
                for (Long setmealId : setmealIds) {

                    Setmeal setmeal = new Setmeal();
                    setmeal.setId(setmealId);
                    setmeal.setStatus(StatusConstant.DISABLE);
                    setmealMapper.update(setmeal);

                }
            }


        }
    }

    /**
     * 根据id查询菜品
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> list(Long categoryId) {
        Dish dish = new Dish();
        dish.setCategoryId(categoryId);
        dish.setStatus(StatusConstant.ENABLE);

        return  dishMapper.list(dish);

    }
    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    @Override
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
